bfd/

	* elf32-ppc.h (ppc_elf_select_plt_layout): Update prototype.
	(enum ppc_elf_plt_type): Move from..
	* elf32-ppc.c: ..here.
	(struct ppc_elf_obj_tdata): Add makes_plt_call and has_rel16.
	(struct ppc_elf_link_hash_table): Reorder.  Add old_bfd.  Delete
	can_use_new_plt.  Make is_vxworks a bitfield.
	(ppc_elf_link_hash_table_create): Don't clear is_vxworks (again).
	(ppc_elf_check_relocs): Update setting of reloc flags.  Set old_bfd.
	(ppc_elf_select_plt_layout): Modify parameters.  Use bfd reloc
	flags to better detect object files needing old bss-style plt.
	Allow secure plt to be used without rel16 relocs being detected.
	Warn if secure plt request cannot be allowed.
ld/
	* emultempl/ppc32elf.em (plt_style): New variable.
	(old_plt): Delete.
	(ppc_after_open): Adjust ppc_elf_select_plt_layout call.
	(PARSE_AND_LIST_PROLOGUE): Define OPTION_NEW_PLT, renumber
	OPTION_OLD_PLT, OPTION_OLD_GOT and OPTION_STUBSYMS.
	(PARSE_AND_LIST_LONGOPTS, PARSE_AND_LIST_OPTIONS): Add secure-plt.
	(PARSE_AND_LIST_ARGS_CASES): Handle OPTION_NEW_PLT.
	* ld.texinfo (--secure-plt): Document.

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